Oh, do not know diameter, they fit both E and B cylinders. The regulators fit on them well.

Does this fit a Smart Dose regulator?

I do not know what a smart dose is??

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Oxygen Tank Regulator Brass Yoke Washer Seals by - Pack of 25

Product ID: 398860290

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Details

Exterior finish
Brass
Fastener size
1/4-18 NPT
Material
Brass
Size
25-PACK
Washer type
Yoke

⏳Recommended replacement every 6 months

🔧Precision fit for oxygen regulators

🛠️25-pack durable brass washers

Description

🔧 Seal your safety with style — never compromise on quality!

BULK PACK CONVENIENCE - Get 25 washers in one pack—never run out during critical maintenance cycles.
ENGINEERED FOR SAFETY - Designed specifically for oxygen regulators and conservers to maintain optimal performance and safety standards.
RELIABLE SEAL EVERY TIME - Top-quality brass and Buna-N construction ensures airtight, leak-proof connections for your oxygen tanks.
TRUSTED BY PROFESSIONALS - Preferred choice for DIY enthusiasts and pros alike, ensuring peace of mind with every seal.
LONG TERM COST EFFICIENCY - Replacing seals every six months prevents costly leaks and equipment damage, saving you money and downtime.

This pack of 25 brass yoke washers features durable brass and Buna-N construction, designed to provide a secure, leak-proof seal for oxygen tank regulators. Ideal for replacement every six months, these washers ensure safety, reliability, and cost-effective maintenance for both professionals and DIY users.

Specifications

ASIN	B07VHL6P83
ASIN	B07VHL6P83
Best Sellers Rank	1,319,960 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,641 in Tap & Valve Washers
Brand	Responsive Respiratory
Date First Available	17 July 2019
Item model number	200-0122-25
Manufacturer	JWYN
Product Dimensions	12.7 x 7.62 x 0.64 cm; 23 g
Units	25.0 count

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TrustScore 4.5 | 7,300+ reviews